Variable inductance



E. T. TURNEY VARIABLE INDUC'I'ANCE Filed Mar.

Feb. 1s. 1923.

Patented Feb. 13, 1923.

UNlTED STATES YORK, ASSIGNOR TO EUGENE T. TUB-NEY NEW JERSEY, ACORPORATION OF NEW EUGENE T. TURNEY, OF HOLMES; NEW LABORATORIES, INC.,OF NEWARK, JERSEY.

VARIABLE INDUC'IANCE.

Application filed March 22, 1921. Serial No. 454,551.

To all who m, it may concern Be it known that I, EUGENE 'l. TURNEY, acitizen of the United States, and a resident of Holmes, Dutchess County,and State of New York, have invented certain new and useful Improvementsin Variable Inductances, of which the following is a specification.

Mypresent invention relates to radio com munication and transmission ofenergy.

Special objects of the invention are to providean inductance adaptableto, the various requirements of radio work, which can be quickly andaccurately adjusted and connected in various relations and which will beof particularly compact, simple and sturdy construction, with the coilelements protected against mechanical injury.

. These and other objects are attained in the structure illustratedin'the accompanying drawing forming a part of this specification andwhich typifies one of the practical forms the invention may take. v

Figure 1 is a plan view of the device with the top of the box shownbroken away to disclose the intermediate primary coil-and with themovable doors and coil supports indicated both .in fully open and partlyclosed positions.

Figure 2 is a frontview of the device with the coil-carrying doorsshown'in fully open position, the front wall of the box-in this casebeing broken away to disclose the intermediate or relatively fixed coil.

Figure 3 is a broken detail and partly sectional view of theintermediate coil construction.

As shown in these views. the invention comprises a box or casing forhousing the coils, which is open at opposite sides and there providedwith doors or closures which serve also as adjustable carriers orsupports for the inductively related coils.

As illustrated. this box comprises fixed top and bottom walls 5 and 6rigidly connected by front and back walls 7 and 8. The open frame thusprovided is closed at the opposite sides thereof by movable doors 9 and10.

These doors or closures are shown as hingcdlv supported at the rearbetween the top and bottom 3 and 6 and menus are provided for releasablysecuring the same in the various angular relations to which they may beadjusted. These boxes are usually constructed of wood or similarmaterial and when this is the case, the means for thus securing thedoors may consist, as shown, of wood screws 11, 12 passed through thetop and bottom into the edge portions of the doors, there beingsufiicient friction in this type of joint to yieldinglyhold the doors atthe points where they are set.

The apparatus of the present disclosure is provided with three coils,the intermediate relatively fixed primary coil 13 the secondary coil 14and the so-called tickler coil 15, the latter two being supported on theinner faces of the doors and being therefore shiftable as the doors areopened and closed, to vary therelative inductance.

an three coils are shown as of the fiat spiral type covered by my Patent#1372850, and consisting each of a wire wound spirally in the slotsbetween the radiating arms of a fiat insulating disc. These fiat coressupport the convolutions of the wire and serve in'the present disclosurealso as a means for mounting the coils, the cores 16 of the door-carriedcoils having screws 17 passed therethrough into the doors and the core18 of the intermediate coil being engaged in a circular seat 19 providedin the supporting partition 20 which is held in grooves 21 formed in thetop and bottom of the box. This last-mentioned core is shown asheldinits seat by clips 22 which may be of the ordinary paper-fastenervariety.

The coils arejsupported on the doors so that when the doors are fullyclosed. as shown in dotted lines in Figure 1. the three coils will standin closely juxtaposed rela tion. To bring about this relation. spacers23 may be interposed at the back of the coils on the doors. thesespacers being of sufiicient extent to hold the coils at the proper dis'tance from the face of the doors so that when the doors are closed. thecoils will be brought close together. This spacing of the coils from thedoors also provides room for the leading-out wires 24.

The back wall 8 at the hinge edge of the box is also utilized as asupport for the ter minals. In the illustration this wall, which is madeof wood or other insulating material. carries a pair of binding posts orterminals 25 for the coil 15, a pair of terminals 26 for theintermediate coil 13 and a pair of terminal posts 27 for the other doorcoil 14. These binding posts. are all freely acces sible at the back ofthe box so that Connections with external circuits may be readily Wittfines inteniieai e mu be me that tr'h'e'ii th' dei ie is not in use andthe doom are closed all three coils will-beifullypm tccted and that evenwhen adjustments are being made, the CllS'EWln b6;-'t'-E h1gG 6x tent,protected by the doors which carry theiiui1"1hese.- 'Hoors net-ye aconvenient hand-hold? for shiftingthe mile ind both outstanding eoiimaybe separately-adjust- 1 ed with mpdct-to the cente cofi and eaohawiIlr-remeirr in the poeitio'n' at fih oh" it has beenaset. 1:

vided wiitliw-oppbsitel'fi disposed l-tihged pentlentij: edjueftmlw doorsii brie-sq} coils. Hr a imiahla indu'ctatdbeg'albox pro- :indadjustable in theumovetnent of said -tneohaniedlly- 'protcted' 'themb'y;'a" coil- .dooistow'a'id and een-enemacoil.

- videdwitlr'a. m fldaddof m: one-side-therel i'nmmbedontheihiiigedtdbmf'end oea't'fofied to be brought. Into? cip iosed'i'elttmoif to the firstio'oil tbhe'oo vemis'closedmml whereby saiddoor" andadhpted'r=' to" be positioned thereby in inddefiive' relation toflth' coil bion to and between he door-curried mils, said fiat doorsupported coils bein; oll'sct inwardly fromthe inner faces of the doorsso is to be thereby carried into close inductire relzition to the boxmil as the doors are closed.

5. In a. variable inductance, :1 box open ill) oppoite sides and havingfixed front and back, top and bottom walls doors closing the open sidesof the box and hinged be tween the topand bottom wells and coupon airingin'dn'ct'zin'ce COiISeflrried by said hinged doors and adjustablerelative to each other in the o'peni'n' and closing movements of thedoors, am? 2L stationary coil supported in the box between the fixed topand hoitom walls.

'6. In a" variable inductance, :x coil box. open: at opposite sides andhaving fi'xed front andtga'ek', to and bottom walls hinged 'dooiefclosing the open sides of the'bo'x and cooperating induct nce coilscarried" by said doors at the inner feces thereof and relati'vel'yddjustelble' in the opening and closing movements of the doors', a11d astationary coil supported in the box between the fixed topaz'i'd'bottom'walls.

open atop o'site s ides and-having fixedbzttik' wall, l'li'nged doorsfor closin g the open s'ides'of the box, coils mounted on and cerby saidhinged doors and'exposed terminais' frsxidcoils mounted on the fixer!back wall 015' tfie-i'boxl S5 In a variable-inductance; a coil box on-av opliosite sides nnd htwing re uti'vel fixed tpr and bottom and rearWa-Il; ternir nals carried by said rear wall, :ucoil' supported betweenthe top and bottom ii v.

movablezdoo'rs clos'nig-theopeir sidels of the box and i'ndnetance coilsmountedon' and carried by said hinged doors.

9. In a rari'riblindiurtzun-e :i coil box [raving slots; in opposite'wulls thereof; a coil support engaged in i=.=1'id":-:l0ts a coilcarried by said support, a movable door for the box and a ooi-hcarried'by'suitl door and in'duvfiively related" to' the first-mentioned coil.

In witness whereof; I have hereunto set inn my hzmctthis 9th dmofMa'i'clu i921.

- EUGENE TURN BY

